JPH06271373A - Lining primer for wet concrete surface, lining method thereof and reinforcing method - Google Patents

Abstract

PURPOSE:To excellently reinforce a concrete structure by sticking a cloth material, nonwoven fabric and fibrous sheet material, etc., using a carbon fiber, a glass fiber, etc., in high adhesion on the surface of the wet concrete of the concrete structure, impregnating a matrix resin into the fiber and curing. CONSTITUTION:The primer consisting of liq. epoxy resin, a hydrophobic polyamine compd., thioxotropic imparting agent and a silane coupling agent is applied onto the surface of the wet concrete. By applying the primer, a fiber sheet, etc., is stuck in high adhesion onto the surface of the wet concrete without being affected by water.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally applies a fiber sheet using carbon fiber, glass fiber, etc., a cloth, a non-woven fabric (mat etc.) to the surface of a concrete structure, and a matrix resin in the fiber. The method relates to a method of impregnating and curing to obtain a fiber-reinforced plastic. More specifically, the lining of the wet concrete surface that enables the adhesion of fiber sheets, cloth, etc. to the wet concrete surface of concrete structures containing water such as bridge girders of river bridges, road tunnels, quay walls of ports, etc. with good adhesion. And a lining method and a reinforcing method thereof.

[0002]

2. Description of the Related Art For example, a reinforcing fiber sheet in which reinforcing fibers are unidirectionally provided on a support sheet via an adhesive layer is attached to the surface of a concrete structure such as an automobile or a railway bridge. It has been attempted to reinforce a concrete structure by impregnating a matrix resin and curing it to obtain a fiber reinforced plastic. Recently, a method for reinforcing a structure using the above has been proposed (Japanese Patent Laid-Open No. 3-222734, 3-224901, etc.).

In the above, the matrix resin is impregnated and the reinforcing fiber sheet is attached by impregnating the matrix resin in the reinforcing fiber in advance at the reinforcement site and then attaching the reinforcing fiber sheet to the concrete surface of the structure. The resin may be applied to the concrete surface, then the reinforcing fiber sheet may be attached, and the reinforcing fiber sheet may be pressed to impregnate the reinforcing fiber sheet with the resin. Furthermore, the support sheet is made resin-permeable,
It is also possible to apply a primer to the concrete surface and attach a reinforcing fiber sheet, and then apply a resin from above the support sheet to impregnate the reinforcing fiber.

According to this, (1) the reinforcing fiber can be impregnated with resin at the site of reinforcement, and the concrete structure can be reinforced with good workability. (2) Use of a room temperature curable resin This makes it possible to easily stiffen and stiffen by leaving it without the need for labor-intensive heating and hardening at the site of reinforcement. (3) Fiber reinforcement not only on the flat concrete surface of the concrete structure but also on curved areas. It has excellent effects such as being reinforced with plastic.

[0005]

In order to obtain a sufficient reinforcing effect by making a reinforced fiber plastic using such a fiber reinforced sheet, it is important to attach the reinforced fiber sheet to the concrete surface with good adhesiveness. is there.

[0006] However, for wet concrete surfaces containing moisture such as bridge piers over rivers, road tunnels, and quay walls of harbors, any of the above-mentioned methods of impregnating matrix resin and attaching reinforcing fiber sheets is used. However, the reinforcing fiber sheet cannot be properly attached due to the water content. Therefore, the intended reinforcing effect may not always be achieved by using the reinforcing fiber sheet.

The above-mentioned problems are not limited to the case where the reinforcing fiber sheet is used to reinforce the concrete structure, and the case where the reinforcing structure sheet is used to waterproof the concrete structure or repair a defective portion. Occurs in

The object of the present invention is to attach a reinforcing fiber cloth material such as carbon fiber or glass fiber, a non-woven fabric or a sheet material to a wet concrete surface of a concrete structure with good adhesiveness, and impregnate the fiber molded product with a matrix resin. It is intended to provide a lining primer which can be hardened to satisfactorily reinforce a wet concrete surface.

Another object of the present invention is to provide a lining method for attaching a reinforcing fiber cloth material, non-woven fabric or sheet material to a wet concrete surface of a concrete structure with good adhesiveness.

Still another object of the present invention is to apply a resin-impregnated unidirectional reinforcing fiber sheet to a wet concrete surface of a concrete structure with good adhesiveness and cure the matrix resin impregnated in the fiber. By providing a method for reinforcing a wet concrete surface.

[0011]

The above object can be achieved by the primer for lining wet concrete surface, the lining method and the reinforcing method according to the present invention. In summary, the present invention is a plumer for lining wet concrete surfaces, which comprises a liquid epoxy resin, a hydrophobic polyamine compound, a thixotropic agent and a silane coupling agent.

In the present invention, the wet concrete surface is coated with a primer comprising a liquid epoxy resin, a thixotropic agent, a hydrophobic polyamine compound and a silane coupling agent,
Next, a wet concrete surface characterized in that a cloth material, a non-woven fabric, or a sheet material of reinforced fiber not impregnated with resin is then impregnated and adhered using a room temperature curable resin such as a room temperature curable epoxy resin. Lining method.

Further, the present invention applies a primer comprising a liquid epoxy resin, a thixotropic agent, a hydrophobic polyamine compound and a silane coupling agent to a wet concrete surface, and then unidirectionally strengthening the resin without impregnation. It is a method for reinforcing a wet concrete surface, which comprises impregnating and adhering a fibrous sheet with a room temperature curable resin such as a room temperature curable epoxy resin and adhering the fiber sheet.

Preferably, 0.1 to 50 parts by weight of the thixotropic agent is added to 100 parts by weight of the liquid epoxy resin and the hydrophobic amine compound in total, and 0.1 to 50 parts of the silane coupling agent. Add 20 parts by weight.

The above-mentioned application of the room temperature curable resin to the cloth material, nonwoven fabric or sheet material of the reinforcing fiber after the plummer application is impregnated with the resin in the reinforcing material of the cloth material at the time of application and then wet. Even if it is adhered and attached to the concrete surface, or even if a resin is applied to the wet concrete surface and a cloth material or the like is adhered and adhered and then pressed from above to impregnate the resin into the fiber, Alternatively, the cloth material or the like may be temporarily adhered to the wet concrete surface, and then the resin may be applied to the cloth material or the like to impregnate the reinforcing fibers, and thus the adhesive material may be adhered and applied.

The present invention will be described in detail below.

As described above, according to the present invention, in order to enable the reinforcing fiber sheet to be adhered favorably to the wet concrete surface of the concrete structure without being affected by moisture, the wet concrete surface is provided with a liquid epoxy resin or a hydrophobic resin. A major feature is the use of a primer composed of a polyamine polyamine compound, a thixotropic agent and a silane coupling agent.

In the present invention, as the liquid epoxy resin of the primer, bisphenol A type epoxy resin, bisphenol F type epoxy resin, phenol novolac type epoxy resin or tetraglycidyl diaminodiphenylmethane (TGDDM) can be used. Liquid epoxy resin has a viscosity of 200,000 cp at 20 ° C.
Those of s or less are preferable. A reactive diluent and a non-reactive diluent can be added to these liquid epoxy resins as needed.

The hydrophobic polyamine compound serves as a curing agent for the liquid epoxy resin, and the hydrophobic curing agent is used to make the primer hydrophobic so that the primer applied to the wet concrete surface does not absorb water. Is done. When the applied primer absorbs water, the physical properties of the primer coating film after curing deteriorate, and the adhesiveness of the reinforcing fiber sheet attached thereon cannot be sufficiently obtained.

In the present invention, the hydrophobicity of the polyamine compound means the hydrophobicity defined in the following mixing test with water.

10 ml of water in a 300 ml transparent cup
0 g and 100 g of the polyamine compound are added, and the mixture is stirred with a 4-blade electric stirrer at 200 to 300 rpm for 10 minutes and then left standing for 1 day. Then, depending on the type of the polyamine compound, as shown in FIG. 1 (A), the water layer 1 and the polyamine layer 2 are clearly separated visually, and as shown in FIG. 1 (B), the water layer 1 and the polyamine layer 2 are separated. And a hydrated layer 3 between them, as shown in FIG. 1 (C), which becomes a compatible layer 4 which is compatible with water and polyamine and has no separation. When the water layer 1 and the polyamine layer 2 shown in FIG. 1 (A) are separated, the polyamine compound is defined to be hydrophobic.

As the hydrophobic polyamine compound, one or more kinds selected from chain-like aliphatic polyamines, cycloaliphatic polyamines, aromatic polyamines and modified products thereof exhibiting hydrophobicity can be used. it can.

As an example, an epoxy-modified compound obtained by hydrophobizing an aliphatic polyamine (which is hydrophilic) such as diethylenetriamine, triethylenetetramine, tetraethylenepentamine, ethylenediamine, and hexamethylenediamine by epoxy modification; N -Cycloaliphatic polyamines (hydrophobic) such as aminoethylpiperazine, mensendiamine, isophoronediamine and modified compounds thereof; aromatic polyamines (hydrophobic, such as xylylenediamine, metaphenylenediamine, diaminodiphenylmethane (DDM)) And modified compounds thereof.

Examples of the above-mentioned modified compound include addition reaction products of epoxy resin, addition reaction products of ethylene oxide / propylene oxide, addition reaction products of acrylonitrile, and the like.

The thixotropic agent is for increasing the apparent viscosity of the primer after coating (conferring thixotropy) to prevent the primer from being repelled. Since the primer in the present invention is hydrophobic, if the fluidity of the primer applied to the wet concrete surface remains high, the primer is gradually repelled after application, and the primer cannot be spread all over the execution surface. . If a thixotropic agent is added, the flowability of the primer can be lowered after application, so that the primer does not gradually repel.

As such thixotropic agent, silica powder (aerosil type), mica powder, asbestos powder, carbon black, carbon whiskers or calcium carbonate powder can be used.

The thixotropic agent is added in an amount of 0.1 to 50 parts by weight, preferably 0.5 to 10 parts by weight, based on 100 parts by weight of the liquid epoxy resin and the hydrophobic amine compound. . If the addition amount is less than 0.1 part by weight, the effect of imparting thixotropy is not obtained, and if it exceeds 50 parts by weight, the primer has a high viscosity and application becomes difficult.

Since the thixotropic agent is for imparting thixotropy to the liquid epoxy resin, it is premixed with the epoxy resin and used as the main component of the primer.

The silane coupling agent is an organosilicon compound having two or more types of reactive groups in the molecule, and one or two reactive groups of the silane coupling agent located on the surface of the primer may be an epoxy resin in the primer or the like. And the remaining one or two reactive groups react with the concrete surface of the wet concrete surface to firmly bond the primer to the wet concrete surface.

As such a silane coupling agent, chloropropyltrimethoxysilane, vinyltrichlorosilane, vinyltriethoxysilane, vinyltris (2-methoxyethoxy) silane, γ-methacryloxypropyltrimethoxysilane, β- (3 , 4-epoxycyclohexyl) ethyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, N-β- ( Aminoethyl) -γ-aminopropyltrimethoxysilane, γ-ureidopropyltriethoxysilane and the like can be used.

The amount of the silane coupling agent added is preferably in the range of 0.1 to 20 parts by weight, based on 100 parts by weight of the total amount of the liquid epoxy resin and the hydrophobic amine compound.
If it is less than 10 parts by weight, the coating film of the primer after curing will not have sufficient adhesive strength with the wet concrete surface, and if it exceeds 20 parts by weight, the physical properties of the coating film of the primer will deteriorate and the adhesive strength will gradually decrease.

In the present invention, a main agent prepared by mixing a thixotropic agent with a liquid epoxy resin, a hydrophobic polyamine compound,
The silane coupling agent can be used as it is as a three-pack type primer, but it can be used as a two-pack type primer by mixing the silane coupling agent with the main component or the hydrophobic polyamine compound. You can also According to the two-pack type primer, the complexity of the on-site preparation is eliminated, the error of the mixing amount is reduced, the primer can be easily prepared, and the work efficiency is improved.

When used as a two-component primer,
It is preferable that the silane coupling agent having an epoxy group is mixed with an epoxy resin as a main component, and the silane coupling agent having an amino group is mixed with a hydrophobic amine compound as a curing agent. This is because, depending on the combination of the silane coupling agent with the component to be mixed, the silane coupling agent reacts and deteriorates during storage of the mixture, and the desired adhesive performance cannot be exhibited in the primer.

Examples of the silane coupling agent having an epoxy group include β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane and γ-glycidoxypropyltrimethoxysilane. As the silane coupling agent having an amino group, γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, N-β- (aminoethyl) -γ-aminopropyltrimethoxysilane, N-β- ( Aminoethyl) -γ-aminopropyltriethoxysilane. A hygroscopic agent can be added in order to ensure the storage stability of the silane coupling agent. The hygroscopic agent is added to the side of the main agent or curing agent to which the silane coupling agent is added. For example, since a silane coupling agent having an epoxy group is added to the base material, a hygroscopic agent is added to the base material. As the hygroscopic agent, dry viscosity, acid anhydride such as calcium chloride, phthalic anhydride, maleic anhydride, orthoformate ester, silica gel and molecular sieve can be used. Also, to control the curing speed of the primer,
A curing accelerator or a curing retarder can be added.

Specific examples of the present invention will be described below.

[0036]

【Example】

Examples 1 to 11 Three-component type primers having the compositions shown in Table 1 were prepared and named as Examples 1 to 11. A method for preparing the primer of Example 1 will be described. The primers other than those of Example 1 were also prepared according to this.

As a liquid epoxy resin, 100 parts by weight of Epicoat 828 (EP-828) made by Yuka Shell is used.
As a thixotropic agent, 5 parts by weight (5 phr) of silica powder (Aerosil, manufactured by Nippon Aerosil Co., Ltd.) was added, stirred, and passed through a three-roll mixer three times to sufficiently disperse, and this was used as a main component of the primer.

A curing agent was prepared by adding 3 parts by weight of phenol as a reaction curing accelerator to 100 parts by weight of a DDM ethylene oxide-modified product as the hydrophobic polyamine compound. The polyamine compound used for the present curing agent showed the hydrophobicity shown in FIG. 1 (A) in the mixing test with water.

As a silane coupling agent, A-187 (γ-glycidoxypropyltrimethoxysilane) manufactured by Nippon Unicar was used.

The main component / curing agent / silane coupling agent were mixed in a mixing ratio of 100/30/3 by weight to prepare a primer of Example 1.

A commercially available mortar board for adhesion test (manufactured by Nippon Test Panel, 70 mm width × 70 mm length × 20 mm thickness mortar panel) was used to form a wet mortar board in Examples 1 to 1.
11 and the three-component type primer of Comparative Examples 1 to 5 are applied,
A building laboratory type adhesion test (JIS-A-6909) was carried out.

The mortar board was immersed in water for one day and night after sanding the reinforced surface. Next, it was taken out from the water and the water on the construction surface was wiped off, and then the primer was applied to the construction surface of the mortar board. Then, as shown in FIG. 2, the mortar plate 5 is accommodated in a container 6 while being supported by a supporting member 7 with the surface (construction surface) on which the primer 9 is applied facing upward, and 5 mm from the surface of the mortar plate 5 there. The mortar plate 5 was set in a wet state by filling it with water 8 to a depth of 2 and cured in this state at 20 ° C. for 2 days to cure the coating film of the primer 9. Then, the mortar board 5 was pulled out from water and further cured at 20 ° C. for 5 days to obtain an adhesion test piece.

Next, as shown in FIG. 3, the mortar plate 5 of the test piece was tested on the primer 9 side with a tensile tester (Instron).
It is attached to the jig 11a on the table with the adhesive 10.
It was pulled through the upper and lower jigs 11a and 11b. The mortar plate 5 was provided with a notch 12 from the side of the primer 9 in advance at a position outside the bonded portion by the adhesive 10.

Table 1 shows the adhesion test results of the primers of Examples 1 to 11.

[0045]

[Table 1]

Further, using a commercially available mortar plate for adhesion test (manufactured by Nippon Test Panel, 70 mm × 150 mm × 10 mm mortar panel), a unidirectional carbon fiber sheet was attached and bent by the three-component type primer of Examples 1 to 11. The test was conducted. The procedure is the same as above until the mortar plate is set in a wet state and a three-pack type primer is applied and cured.

After that, by pulling it up from water, one layer of unidirectional carbon fiber sheet (Folkatou sheet FTS-C1-17 manufactured by Tonen KK) was applied to the construction surface coated with the primer so that the fibers were oriented in the longitudinal direction of the mortar board. It was affixed to and was impregnated with a matrix resin for construction. The matrix resin is an epoxy resin adhesive for construction (FR resin FR-E manufactured by Tonen Corporation).
3) was used and applied to the primer surface, a carbon fiber sheet cut into a mortar area (70 mm width × 150 mm length) was attached, and the resin adhesive was replenished and impregnated with a rubber spatula. .

The mortar board on which the carbon fiber sheet is applied is
It was cured in a dry state at 20 ° C. for 7 days to obtain a bending test piece.

As shown in FIG. 4, the mortar plate 1 of the test piece
3 is supported at two points with a span of 100 mm with the side of the carbon fiber sheet 14 facing down, and a measuring device (made by Shimadzu Corporation Auto) from a Teflon pad plate 15 with a thickness of 3 mm provided at the center of the mortar plate 13 Press the indenter 16 (graph radius 5mm) at the crosshead speed of 2mm /
A three-point bending test was performed by pressing with a minute, and the reinforcing effect using the carbon fiber sheet was evaluated. The results are shown in Table 3.

Comparative Examples 1 to 5 Three-component type primers having the compositions shown in Table 2 were prepared according to the primer preparation method of Example 1 to obtain the primers of Comparative Examples 1 to 5.

Then, in the same manner as in Examples 1 to 11, a mortar plate in a predetermined wet state (70 mm width × 70 mm length × 2) was used.
0 mm thick) with a primer and a predetermined curing to obtain an adhesion test piece, which is used as a building laboratory type adhesion test (JIS-A
-6909) was carried out. The results are shown in Table 2.

[0052]

[Table 2]

Similarly, a unidirectional carbon fiber sheet was attached to a mortar plate (70 mm × 150 mm × 10 mm) in a predetermined wet state by a primer, and a predetermined curing was performed to obtain a bending test piece, and three points were used under the same conditions. A bending test was performed. The results are shown in Table 3.

[0054]

[Table 3]

As shown in Table 1, in the case of Examples 1 to 11, a high primer adhesive strength of ^{20 to} 23 kg / cm ² was obtained, and the destruction mode was not the interface destruction of the primer coating film, but the mortar plate was destroyed. The base material has been destroyed. On the other hand, in Comparative Examples 2 and 3, as shown in Table 2, the adhesive strength and the breakage mode could not be measured because the primer could not be applied due to the high viscosity and the uncoated portion was generated due to the splash of the primer resin. . Even in Comparative Examples 1, 4 and 5 in which the primer was normally applied, the adhesive strength was 1 to 8 kg.
/ Cm ² was extremely low, and the failure mode was interface failure of the primer coating film.

Further, when the mortar plate is not reinforced, the breaking load is 40 kgf, whereas in Examples 1 to 12, the mortar plate is reinforced with carbon fibers, and therefore, as shown in Table 3, high breaking strength is achieved. A load is obtained, for example in the case of Example 1,
A breaking load of 405 kgf was shown. As for the destruction mode, when not reinforced, as shown in FIG. 5 (A), the mortar plate 13 straightly cracks and breaks at the center, whereas in the case of Example 1, as shown in FIG. 5 (B), The mortar plate 13 is cracked and broken diagonally from the center, and the carbon fiber sheet 1
There was no peeling of the adhesive interface of 4 (peeling of the sheet 14).

On the other hand, in the case of Comparative Example 1, for example, the breaking load was 120 kgf, and although the breaking load increased as compared with the unreinforced product, it was far below Example 1. The destruction mode is as shown in FIG. 5 (C).
After the tensile surface (adhesive surface of the carbon fiber sheet 14) was cracked, the sheet 14 was broken in a mode in which the adhesive interface peeled off.

Examples 12 to 16 Liquid epoxy resin (Epicote 828 made by Yuka Shell)
(EP-828) was mixed with 5 parts by weight of silica powder (Aerosil, manufactured by Japan Aerosil Co., Ltd.) with 100 parts by weight, and the mixture was passed through a three-roll mixer three times to sufficiently disperse the silica powder, and then γ-glyce 5 parts by weight of sidoxypropyltrimethoxysilane (A187 manufactured by Nippon Unicar) was added, stirred and mixed, and this was used as a main component A liquid of the primer.

3 parts by weight of phenol as a reaction curing accelerator was added to 100 parts by weight of DDM as an ethylene oxide-modified product as a hydrophobic polyamine compound to obtain a curing agent B liquid.

In order to check whether there is a change in the adhesive performance of the main agent liquid A after storage, the liquid A is usually placed in a commercially available 1 liter metal can and capped, and the temperature is 20 ° C. and the humidity is 40%.
Example 12 while storing in a controlled room, the solution A was periodically taken out and mixed with the curing agent solution B over a period of 2 months.
~ 16 primers. The mixing ratio of the main agent liquid A and the curing agent liquid B is 100/30 in parts by weight.

The primer thus prepared was used in Example 1
In the same manner as in No. 11 to 11, a mortar board in a predetermined wet state was applied, and predetermined curing was performed to obtain an adhesion test piece, and similarly, a building laboratory type adhesion test (JIS-A-6909) was performed. The results are shown in Table 4.

Examples 17 to 20 Liquid epoxy resin (Epicote 828 made by Yuka Shell)
To 100 parts by weight of (EP-828), 5 parts by weight of silica powder (Aerosil, manufactured by Nippon Aerosil Co., Ltd.) is mixed and passed through a three-roll three times to sufficiently disperse the silica powder. It was designated as solution A.

3 parts by weight of phenol as a reaction curing accelerator was added to 100 parts by weight of DDM as an ethylene oxide-modified product as a hydrophobic polyamine compound, and γ-aminopropyltriethoxysilane (manufactured by Nippon Unicar Co., Ltd.
1100) was added and stirred and mixed to prepare a curing agent B liquid.

In order to check whether there is a change in the adhesive performance of this curing agent liquid B after storage, the liquid B is usually put in a commercially available 1 liter can and capped, and the temperature is kept at 20 ° C. and the humidity is 40%. While storing in a controlled room, the solution B was periodically taken out over a period of one month and mixed with the solution A as the main ingredient, and the solutions of Examples 17 to 2 were used.
0 primer was used. The mixing ratio of the main agent liquid A and the curing agent liquid B is 100/30 in parts by weight.

The primer thus prepared was used in Example 1
In the same manner as in No. 11 to 11, a mortar board in a predetermined wet state was applied, and predetermined curing was performed to obtain an adhesion test piece, and similarly, a building laboratory type adhesion test (JIS-A-6909) was performed. The results are shown in Table 4.

[0066]

[Table 4]

As shown in Table 4, Examples 12 to 16
Then, although the silane coupling agent was mixed with the main agent liquid A, the adhesive performance of the primer did not deteriorate even after the liquid A was stored for 2 months. Similarly, Examples 17-2
In No. 0, the silane coupling agent was mixed with the hardener solution B, but the adhesive performance of the primer did not deteriorate even after the solution B was stored for one month.

[0068]

As described above, in the present invention, since the wet concrete surface of the concrete structure is coated with the liquid epoxy resin, the hydrophobic polyamine compound, the thixotropic agent and the silane coupling agent, the pramie is applied.
A fibrous sheet using carbon fiber, glass fiber, etc., cloth, non-woven fabric (mat, etc.) can be adhered to the wet concrete surface with high adhesiveness and lined without being affected by water. Therefore, by impregnating the matrix resin (room temperature curing resin) in the fiber and curing it, the concrete structure can be reinforced well, and if desired, waterproof and repaired.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing various aspects of a mixing test result with water used for defining hydrophobicity of a polyamine compound in the present invention.

FIG. 2 is a cross-sectional view showing a curing method for a mortar plate coated with a primer in the adhesion test of the present invention.

FIG. 3 is a cross-sectional view showing a state of a tensile test of a mortar plate coated with a primer in an adhesion test.

FIG. 4 is a cross-sectional view showing a state of a bending test of a mortar plate on which a carbon fiber sheet according to the present invention is applied.

FIG. 5 is a cross-sectional view showing various modes of destruction of a mortar plate in a bending test.

[Explanation of symbols]

 5, 13 Mortar board 9 Primer 14 Carbon fiber sheet 16 Indenter

Continuation of front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location C08L 63/00 NKY 8830-4J C09J 163/00 JFN 8830-4J

Claims (3)

[Claims] 1. A lining pramie for lining a wet concrete surface, which comprises a liquid epoxy resin, a hydrophobic polyamine compound, a thixotropic agent and a silane coupling agent. 2. A wet concrete surface is coated with a primer composed of a liquid epoxy resin, a thixotropic agent, a hydrophobic polyamine compound and a silane coupling agent, and then a resin-impregnated reinforcing fiber cloth material, A method for lining a wet concrete surface, which comprises applying a non-woven fabric, a sheet material, or the like by impregnating and adhering them with a room temperature curable resin such as a room temperature curable epoxy resin. 3. A wet concrete surface is coated with a primer comprising a liquid epoxy resin, a thixotropic agent, a hydrophobic polyamine compound and a silane coupling agent, and then a unidirectional reinforcing fiber sheet not impregnated with the resin is applied thereon. A method for reinforcing a wet concrete surface, which comprises impregnating and adhering a room temperature curable resin such as a room temperature curable epoxy resin and adhering it.